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Colloidal precipitates01:09

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Flash NanoPrecipitation for the Encapsulation of Hydrophobic and Hydrophilic Compounds in Polymeric Nanoparticles
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Dynamic wetting by concentrated granular suspensions.

Reza Azizmalayeri1, Peyman Rostami1, Thomas Witzmann1

  • 1Leibniz Institute of Polymer Research Dresden (IPF), Institute of Physical Chemistry and Polymer Physics, 01069 Dresden, Germany. auernhammer@ipfdd.de.

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Summary
This summary is machine-generated.

The flow behavior of concentrated suspensions near moving contact lines deviates significantly from Newtonian predictions, especially with stronger particle interactions. This impacts applications like coatings and 3D printing.

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Area of Science:

  • Rheology
  • Fluid Dynamics
  • Materials Science

Background:

  • Concentrated granular suspensions are vital in coatings and 3D printing.
  • Contact line dynamics and suspension structure interact via shear-dependent viscosity.
  • Non-Newtonian rheology near contact lines in dense suspensions is not well understood.

Purpose of the Study:

  • Quantify deviations from Newtonian solutions in dense suspensions.
  • Investigate the influence of interparticle interactions on flow behavior.
  • Understand the rheology of concentrated suspensions near advancing contact lines.

Main Methods:

  • Used silica particles in two dispersion media to vary interparticle interactions (weak vs. strong).
  • Employed astigmatism particle tracking velocimetry (APTV) to track 3D particle trajectories.
  • Studied internal flows within a driven drop over a substrate.

Main Results:

  • Observed distinct flow behaviors based on particle interactions and suspension rheology.
  • Stronger non-Newtonian effects led to greater deviation from Newtonian flow profiles.
  • Shear-thickening suspensions showed notable deviations; yield-stress suspensions exhibited plug flow.

Conclusions:

  • Interparticle interactions significantly alter suspension flow near contact lines.
  • Newtonian hydrodynamics are insufficient for dense suspensions with pronounced non-Newtonian behavior.
  • Understanding these deviations is crucial for optimizing functional material applications.